<template>
<el-container class="home-container">
  <!-- 头部区域 -->
  <el-header>
    <div>
      <span>电商后台管理系统</span>
    </div>
    <el-button type="warning" plain @click="loginOut">退出</el-button>
  </el-header>
  <!-- 页面主体区域 -->
  <el-container>
    <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '70px' : '200px'">
      <div class="toggle-button" @click="toggleCollapse">
        <i class="el-icon-menu"></i>
      </div>
      <!-- 侧边栏菜单区域 -->
      <el-menu background-color="#99CCFF" text-color="#fff" active-text-color="#333366" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
        <!-- 一级菜单 -->
        <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
          <!-- 一级菜单的模板区 -->
          <template slot="title">
            <i :class="iconsObj[item.id]"></i>
            <span>{{item.authName}}</span>
          </template>
          <!-- 二级菜单 -->
          <el-menu-item :index="'/'+subItem.path+''" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path+'')">
            <template slot="title">
              <i class="el-icon-minus"></i>
              <span>{{subItem.authName}}</span>
            </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
    </el-aside>
    <!-- 右侧内容主体 -->
    <el-main>
      <!-- 路由占位符 -->
      <router-view></router-view>
    </el-main>
  </el-container>

</el-container>

</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    loginOut () {
      // 清空 token
      window.sessionStorage.clear()
      // 跳转到登录页
      this.$router.push('/login')
    },
    // 获取所有的左侧菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      // console.log(res);
    },
    // 点击按钮，切换菜单的展开与折叠
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  background: #66CCFF;
  font-size: 20px;
  // color: #fff;

  >div {
    display: flex;
    align-items: center;

    span {
      padding-left: 15px;
      font-size: 35px;
    }
  }
}
.el-aside {
  background: #99CCFF;
  .el-menu{
    border: none;
    .el-submenu__title{
      i[data-v-8dc7cce2]{
        color: #fff;
        font-size: 20px;
      }
      span{
        font-size: 17px;
      }
    }
    .el-menu-item{
      color: #fff;
      i{
        color: #fff;
        font-size: 20px;
      }
      span{
        font-size: 15px;
      }
    }
  }
}
.el-main {
  background: #eaedf1;
}
.iconfont{
  padding: 10px;
}

.toggle-button{
  line-height: 40px;
  background-color: #0099CC;
  font-size: 30px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
